Answer: C
Explanation:
the rate equation comes from
y=mx+b b is your initial fee and m is charge for every shirt
For S
y=5.5s+80
For T
y=7.5s+50
They want to know T<S
or 7.5s+50<5.5s+80
A wrong, not even right equations
B wrong, because T>S and that's not what you want
C correct
D wrong the equation is wrong